| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a motor driver which reduces a torque ripple, a vibration and a noise at a motor drive time and which simultaneously has a high output and a high efficiency. <P>SOLUTION: This motor driver includes a voltage supply unit for supplying a voltage to three-phase drive coils, and a voltage supply rate controller for controlling the amplitude of the voltage to each phase drive coil. The voltage is supplied to become a first value≤second value, wherein the first value is the amplitude of an applied voltage during a first voltage supply period from a suspension state to a certain set rotational speed, and the second value is the amplitude of an applied voltage during a second voltage supply period to be driven exceeding the set rotational speed. <P>COPYRIGHT: (C)2004,JPO |
